#
DIFF.BLOG
New
Following
Discover
Jobs
More
Top Writers
Suggest a blog
Upvotes plugin
Report bug
Contact
About
Sign up
The home for great developer writing.
We surface the best developer writing from thousands of independent blogs, updated daily.
Join Diff.blog
TOPICS
A circle in the hyperbolic plane
·
John Cook
·
Nov. 28, 2025, 3:09 p.m.
Math
Geometry
Hyperbolic Geometry
complex numbers
mathematics
Geometry
Summary
This blog post explores the concept of circles in the hyperbolic plane, specifically within the context of the upper half plane in complex numbers, and discusses how distances are measured differently in hyperbolic geometry.
Read full post on www.johndcook.com →
MORE POSTS LIKE THIS
Hyperbolic metric
John Cook ·
Nov 26, 2025
Math
Complex Analysis
The E6 Root Polytope
John Carlos Baez ·
Sep 6, 2026
mathematics
mathematics
💠𖡗𖡹𐫰⚪𔗢✺◌⁜𑁍🝱𖡽⩩𖥕 ⠀ ᯽᪣𖦸 ⠀ 𖦸᪣᯽ ⠀ 𖥕⩩𖡽🝱𑁍⁜◌✺𔗢⚪𐫰𖡹𖡗💠
⠀ ᯽ ᯽ ⠀ ·
Aug 28, 2026
游戏
Mobius Transformations
The “Einstein Tile” That Broke Math Is Now Twisting Light Into Pinwheels
Thedebrief ·
Aug 3, 2026
Physics
Science
A digestion of unit distance constructions
Terence Tao ·
Jul 3, 2026
AI
math.NT
A seventeenth-century teacher of geometry, who christened his son Euclid
Thonyc Wordpress ·
May 15, 2026
History of Mathematics
Scientific Instrument Makers
Discover more posts →
AUTHOR
Sponsored
Zulip
Organized team chat for people who take work seriously. Topic-based threading keeps conversations focused.
Try Zulip
Become a sponsor →
BLOG POST FEATURED ON
Hacker News
2 points
Add this plugin to your blog
RECENT POSTS FROM THE AUTHOR
Choose how you want to continue.
Continue with GitHub
Continue with Google